∠DAB=60°,∠ABC=75°,∠BCD=90°. BC=CD=x. What is the circumference of quadrilateral ABCD?
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数学PS
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∠DAB=60°,∠ABC=75°,∠BCD=90°. BC=CD=x. What is the circumference of quadrilateral ABCD?
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正确答案: D